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| Study on Removal of Aluminum from Spent Lithium-Ion Batteries by Alkali Recycling Leaching Process |
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Received:August 30, 2018
Revised:September 03, 2018
Accepted:September 04, 2018
Published Online:November 19, 2018
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| DOI：doi：10.3969/j.issn.1007-7545.2018.12.006 |
| KeyWord:spent lithium-ion batteries; positive active material; aluminum; alkaline leaching |
| Author | Institution |
| Zhang Yong-lu |
北京矿冶科技集团有限公司 冶金研究设计所 |
| Yin Fei |
北京矿冶科技集团有限公司 冶金研究设计所 |
| Jie Xiao-wu |
北京矿冶科技集团有限公司 冶金研究设计所 |
| Ruan Shu-feng |
北京矿冶科技集团有限公司 冶金研究设计所 |
| Wang Zhen-wen |
北京矿冶科技集团有限公司 冶金研究设计所 |
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| Abstract: |
| Process of cyclic alkali leaching and cooling crystallization of aluminum hydroxide was proposed to separate positive active material and aluminum foil current collectors from spent lithium-ion batteries. The results show that average aluminum content in alkali leaching residue is 0.78% with average aluminum extraction rate of 90.98% under the optimum conditions including leaching at 90 ℃ for 2 hours and crystallization at 40 ℃ for 40 hours with crystal seeds dosage of 1.5 times. The cooling crystallizing precipitation product is gibbsite containing 32.14% of Al, 0.15% of Li, 0.04% of Co, and 0.51% of Na respectively, which could be used as raw materials for aluminum recovery. Mother liquor after cooling crystallization contains about 22.08 g/L of Al, which can be returned to alkali leaching stage for recycling. |
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